a(n) is the least k for which A340594(k) = n.

Terms

a(0) =2a(1) =4a(2) =8a(3) =21a(4) =42a(5) =65a(6) =80a(7) =217a(8) =488a(9) =721a(10) =2120a(11) =2349a(12) =2796a(13) =9214a(14) =16043a(15) =23287a(16) =28626a(17) =43588a(18) =58176a(19) =116982a(20) =213435a(21) =444329a(22) =640673a(23) =967248a(24) =1399895a(25) =1449156a(26) =1528785a(27) =2768054a(28) =2915135a(29) =3631071